Receptacle box size question

Reply

  #1  
Old 10-16-05, 12:42 PM
Member
Thread Starter
Join Date: Nov 2004
Location: north dakota
Posts: 159
Receptacle box size question

What's the minimum required box size for a outlet receptacle and (5) 4+1 #12 conductors?
 
Sponsored Links
  #2  
Old 10-16-05, 12:47 PM
Member
Join Date: Feb 2002
Location: port chester n y
Posts: 2,117
Is this a "Code-quiz " related question, or one directed at a practical concern?
 
  #3  
Old 10-16-05, 02:59 PM
Speedy Petey's Avatar
Banned. Rule And/Or Policy Violation
Join Date: Nov 2003
Posts: 2,455
Originally Posted by Skramy
(5) 4+1 #12 conductors?
Explain this please. Is this in conduit?

Each hot or neutral count as one.
ALL the grounds together count as one.
ALL internal clamps together in a metal box count as one.
EACH device counts as two.

Each #12 wire requires a volume allowance of 2.25cu/in.

Plastic boxes are marked with conductcor fill and volume.
Metal boxes are taken from 314.16(A).

The rest is math.
 
  #4  
Old 10-17-05, 07:52 AM
Member
Thread Starter
Join Date: Nov 2004
Location: north dakota
Posts: 159
I want to add 1 outlet to the end of a circuit (not bath, not bedroom not kitchen) The circuit is GFI protected, 20A, with #12 wire. Walls are finished. Can't remove the old recpt box (the recpt I'm tapping into). Probably nailed to the stud. The box is metal and appears to be 14 cu.in. I can, however, fish a wire thru one of the clamps in the box, so wire access is no problem.
So....., I've had a couple opinions that I can and can't add any more #12 wire into this size 14 box. So, what's the deal?
 
  #5  
Old 10-17-05, 08:20 AM
Member
Join Date: Feb 2002
Location: port chester n y
Posts: 2,117
A metal outlet-box with clamps suggests that the Wiring Method is Armored Cable, which means that the cables have no Grounding-conductor, so the capacity-limit of the box depends on the # of nsulated conductors + one device only.

IF this is a "gem" box with a width of 2-1/4", AND IF there are two 12/2 cables clamped to the box, adding another 12/2 cable = six #12 condutors + 2 clamps + 1 device.

If "appearance" is not a concern, use a Wire-Mold extension box ,and a W-M outlet-box. Fasten the back-plate of the X-B to the existing G-B, then fasten the W-M outlet box to the back-plate. The over-all depth will provide the needed cubic-inch capaciity.
 
  #6  
Old 10-17-05, 08:22 AM
Member
Join Date: Sep 2003
Location: Central New York State
Posts: 13,973
A box can always be removed, even when attached to the stud. The box is sometimes destroyed in the process, but it can be removed. In addition, drywall can be repaired.
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes
'